Pump for eilling machines



June 9, 19360 L. DE MARKUS 2,043,578

PUMP FOR FILLING MACHINES Filed May 8, 1931 3 Sheets-Sheet l INVENTORJune 9, 1936. 1.. DE MARKUS 2,043,578

' I PUMP FOR FILLING MACHINES I Filed May 8, 1951 3 Sheets-Sheet 2INVENTOR lune 9, 1936. DE MARKUS 2,043,578

PUMP'FOR FILLING MACHINES Fi led May 8, 1951 3 Sheets-Sheet 3 PatentedJune 9, 1936 um TED STATES PATENT OFFICE Louis De Markus, Pittsburgh,Pa., assignor to McKenna Brass '& Manufacturing Company,

Inc "Pittsburgh, Pa.,

sylvania a corporation of Penn- Application May :8, .1931, Serial No.535384 21 "Claims.

This invention relates to pumpsfor filling machines and is hereinparticularly described as applied to a pump forsupplyingameasured chargeof syrup to .bottles.

In the bottling of carbonated beverages it .is common practice to pumpameasured charge of syrup into the bottles and then fill them to adesired height with carbonated water. The quantity of syrup suppliedmust be accurately determined by the pump, and, because of the nature ofthe syrup, the pumpmust be of suchconstruction that it does not clog orget out of order, does not stick, is readily adjustable, and readilysterilized in the assembled condition or taken apart for purposesofsterilization. Further difficulties are encountered in that there isusually some variation inthe height of the bottles which are fed to themachine. Generally speaking, a filling machine should automaticallyaccommodate itself to variations of as much as %ths of an inch in theheight of the bottle. It'is desirable to have the syrup pump actuatedthrough the medium of the ,bottle, asotherwise if the feeder should missa bottle syrup would be discharged over the machine. The pump must be ofsuch construction that this variation in the bottle height does notalter the quantity of syrup supplied.

My invention provides .a structure whichiu'lfills all the requirementsof a proper syrup pump and is free of the disadvantages above noted. Iprovide a pump cylinder with a piston slidable therein, the cylinder:and the piston being both axially movable, and bias both the cylinderand the piston for movement in one direction. The piston and cylinderare preferably mounted in a bodywhich slides in a frame and which "isautomatically reciprocated as by a cam. When the body is moved down ontothe bottle, one end of the cylinder engages the bottle opening. As thebody continues to move down, the bottle holds the pump cylinder againstmovement, but the piston, being biased toward the bottle, continues tomove down until it reaches the bottom of the piston, discharging syrupinto the bottle. The body continues to move downwardly, but suchmovement is a mere over-travel which takes care of varying bottleheights.

In the accompanying drawings illustrating a present preferred embodimentof the invention,

Figure 1 is a vertical section through a syruping unit embodying myinvention, and

Figures '2 to 5 inclusive are views to enlarged scale of a portion ofFigure 1 showing successive 56 steps in the operation of the syrup pump.

The 'apparatussillustrated in Figure liisasyruping unit for a fillingmachine and comprises a centralstationary post 2 having a rotatablesleeve 3 thereon driven from the filling machine. .The sleeve makes aspline connection 4 witha barrel 5 carried on a bearing 6 by the post 2.The post is adjustableup or .down to take care of different sizedbottles .and the :spline :connection 4 provides a drive for the barrel 5from the sleeve 3 in any adjusted position.

The barrel :5 is bored to receiveslides "6, each carrying cam rollers '1working inthe groove '8 of aibarrel cam made up'of members :9 and I0fixed against rotation on top of the post 2. As the sleeve rotates theslide or ibody 'B moves upwand down in the barrel 5.

Each slide 15 has 'astop ring 'l'l screwed in the bottom to :limit thetravel of 'apump cylinder l2. The pump cylinder is normally urgedagainst the steprring III by :acompression spring l3 so .as to lie intheiposition'of Figures 1 and 2. The bottom of the pump cylinder is'closed off byacap [4 having a center 0peningrl5 leading to valve slotsI5. Thewalve slots areclosed ofi by a rubberring l1 constituting thedischarge valve of the pump. Syrup discharged past the rubber ringtravels through a conduit l'8 to the bottle 3. The-conduit t8 extendsto'the bottle and the lip of the bottle is engaged :by arubb'er ring l9.

A pump piston indicated generally by [the reference character 20 liesinside the cylinder I2. Thispistoh has a body 2-l secured toa syrup tube2 2. A cap 23 "is fastened-to the body 2| by means of screws 24. A plate25 is held against the heads of'therscrews 24 by a draw-rod 26,"extending upwardly through the tube 22. The heads of the screws 24 areof suflicient depth to space the plate 25from the cap 23 so as toprovide inlet ports 21. A rubber ring 2-8 liesin a'groove formed by thecap 23 andthe plate :25 and-constitutes the inlet valve tothe pump.

The piston is normally urged downwardly by means of a compression spring29,b11t this movement is limited by 'a sleeve 30 having ea shoulder 31which constitutes a stop. The sleeve 30 is threaded on the tube 22 andis provided below the shoulder 3| with a bevel gear 32. Ahead 33 isprovided at the upper end of the slide 6%, which head has an opening 34to receive a hand adjusting tool 35. This adjusting tool is rotatable inthe opening 3i. It carries a bevel pinion 36 which, when the tool is inposition, meshes with the bevel gear 32.. Rotation of the hand toolthreads the sleeve 30 up or down on the tube 22 and thusadjusts'thedistance to whichthe piston will be pumped in any adjusted position.

The tube 22 extends upwardly beyond the sleeve 30 and terminates in afitting 38. This fitting has a pad 39 which bears against an extension40 on the slide B and holds the tube against rotation when the sleeve 30is being adjusted. The drawing rod 28 extends upwardly through thisfitting and is provided with a wing nut 4| which holds it in position.This construction permits of ready removal of the parts for cleaning,inspection or removal.

A flexible rubber hose 42 extends from. the fitting 38 to a syrupchamber 43. The syrup chamber rotates with the barrel 5. It is carriedby a hollow extension 44 of the post 2 and is provided with packingglands 45. Syrup is supplied through a hollow fitting 46 on top of theextension 64 and is discharged into the syrup chamber through openings47.- The barrel of the syrup chamber 43 is made of glass so that theincoming syrup may be viewed by'the operator, enabling him to makecertain that there is an adequate supply.

Figures 2 to 4 inclusive show successive steps in the operation of thepump. In Figure 2 the bottle B is positioned below the pump, It will beunderstood that the bottle is carried on a table-which rotates with thebarrel 5. During such rotation the barrel cam forces the slide 6* downand the rubber ring !9 engages the lip of the bottle B. Up until thismoment the vsliderli h'the pump cylinder [2 and the piston 20 move as aunit.

Figure 3 shows the operation during the actual pumping of the syrup. Thesealing ring I9 has engaged the bottle B but the slide b has continuedto move downwardly. The pump cylinder I2 is restrained against downwardmovement and as the slide '6 moves downwardly the spring I3 iscompressed. The spring 29, however, holds the piston 20 in its lowermostposition relative to the slide 6 and therefore the movement is effectivefor discharging the syrup past the rubber ring I l and into the bottle.This continues until the plate 25 strikes the cap l4. Figure 3 shows therelative position'of the parts just after the cap 25 has struck the capM. The entire contents of the pump cylinder has now been discharged andfurther downward movement of the piston is prevented by reason of itsengagement with the cap M which, in turn, is restrained against downwardmovement by the bottle. The slide, however, continues to movedownwardly, but this simply compressed the spring 29 and furthercompresses the spring 53.

Figure 4 shows the parts at the bottom of the stroke. When the slidemoves upwardly the springs 13 and 29 re-expand and continue to press thepiston and the cylinder downwardly as far as possible. After the partshave been returned to the position of Figure 3, the bevel gear 32engages the member 33 and the piston is then carried upwardly with theslide 6 the spring [3 continuing to urge the cylinder downwardly. Thedifierential movement thus brought about between the piston and thecylinder creates a suction, resulting in syrup being drawn from thesyrup'chamber 43 through the hose 42, fitting 38 and tube 22 past theinlet valve 28, filling the pump with a fresh discharge of syrup. Oncontinued upward movement of the slide 6 the cylinder finally reachesits bottom position therein and thereafter the slide, the piston and thecylinder move up as a unit.

Figure 5 shows the parts in the position of Figure 2 except that thepiston has been adjusted downwardly so as to give a very short strokeand a. correspondingly small discharge of syrup.

It will be seen that the construction and operation of the pump arerelatively simple, that the quantity of syrup discharged may be readilyadjusted, and that the entire pump may be easily and thoroughlysterilized. These constitute important advantages of my construction.

I have illustrated and described the present preferred embodiment of theinvention. It will be understood, however, that it is not limited to theform shown but may be otherwise embodied within the scope of thefollowing claims.

I claim:

1. In a filling machine, a source of liquid and O a pump for discharginga measured quantity thereof comprising a body, means for reciprocatingthe same, a stop on the body, a pump cylinder carried by the body,yieldable means urging the cylinder against the stop, a piston slidablein the cylinder, yieldable means urging the piston into the pumpcylinder, a stop for limiting such movement, a rod for the piston, therod being hollow and adapted for the supplying of liquid to the pumpcylinder, and a flexible connection from the hollow piston rod to thesource of liquid.

2. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body,

means for reciprocating the same, a stop on the body, a pump cylindercarried by the body, yieldable means urging it against the stop, apiston slidable in the pump cylinder, yieldable means for urging thepiston into the cylinder, a piston rod, a sleeve adjustable on the rod,and stop means cooperating with the sleeve.

3. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body reciprocable in a vertically extendingdirection, a pump cylinder carried by the body, means for urging thepump cylinder downward- 1y, a stop for limiting the downward movement,means on the lower end of the cylinder for engaging a container, saidmeans including a dis- L means for the piston, a piston rod extendingupwardly, the piston rod being hollow, inlet valve means carried by thepiston, and a source of liquid connected to the hollow piston rod.

4. In a. filling machine, a pump for discharging a measured quantity ofliquid comprising a body, a pump cylinder carried by the body, means forurging the pump cylinder downwardly, a stop for limiting the downwardmovement, means on the lower end of the cylinder for engaginga'container, said means including a discharge valve operable by pressurewithin the pump cylinder for permitting discharge from the pumpcylinder, a piston reciprocable in the cylinder for pumping liquid, saidpiston being also movable relative to the body, and means limitingdownward movement of the piston relative to the body. I

5. In a filling machine, a pump for discharging a. measured quantity ofliquid comprising a slide, means for reciprocating the slide, a pumpcylinder carried by the slide and reciprocable relative thereto, acylinder stop on the slide, a spring for pressing the cylinderagainstysaid stop, a piston reciprocable in the cylinder for dischargingliquid from the cylinder, a spring for biasing the piston in dischargingdirection, and a piston stop on theslide limiting movement of the pistonby its spring relative to the slide.

6. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body, a pump cylinder carried by the body andmovable relative thereto, a stop. on the body, means for biasing thecylinder against the stop, a piston movable longitudinally of thecylinder for discharging liquid from the cylinder, a pressure-operatedinlet valve carried by the piston for controlling the. supply of liquidto the pump cylinder, a stop limiting movement of the piston relative tothe body, and means for biasing the piston against its stop, saidcylinder having means for engaging a container.

7. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body, means for reciprocating said body, a pumpchamber carried by the body, said pump chamber being biased for bringingabout suction of liquid into the same, a member yieldably carried by thebody and cooperating with said pump chamber to displace liquidtherefrom, said member being biased to bring about discharge of liquidfrom the pump chamber, and means limiting the quantity of liquid drawninto said chamber on the suction stroke including means connected to thepiston for limiting movement of said member relative to said body.

8. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body, means for reciprocating said body, a pumpchamber carried by the body, said pump chamber being biased for bringingabout suction of liquid into the same, a member yieldably carried by thebody and cooperating with said pump chamber to displace liquidtherefrom, said member being biased to bring about discharge of liquidfrom the pump chamber, and means limiting the quantity of liquid drawninto said chamber on the suction stroke including adjustable meansconnected to the piston for limiting movement of said member relative tosaid body.

9. In a filling machine, a pump for discharging a. measured quantity ofliquid comprising a body, means for reciprocating said body, a pumpchamber carried by the body, said pump chamber being biased for bringingabout suction of liquid into the same, a member yieldably carriedupwardly and downwardly by the body and cooperating with said pumpchamber to displace liquid therefrom, said member being biased to bringabout discharge of liquid from the pump chamber, and means limiting thetravel of said member relative to said pump chamber on the suctionstroke including means connected to the piston for limiting movement ofsaid pump chamber and movement of said member relative to said body.

10. In a sirup dispenser for bottle filling machines, the combinationwith a reciprocating support, of a sirup receptacle having a deliveryspout, a connection between said support and receptacle for causing saidsupport and receptacle to move together while permitting a continuedmovement of the support after the receptacle has come to rest, a plungerin said receptacle and a support for said plunger carried by and movablerelatively to said reciprocating support.

11. Ina sirup dispenser for bottle filling machines, the combinationwith a reciprocating support, of a sirup receptacle having a deliveryspout, a connection between said receptacle and support for moving thereceptacle and support together while permitting a continued downwardmovement of the support after the receptacle has come to rest on itsdownward movement, a plunger in said receptacle and means engaged bysaid support for raising said plunger as the support moves upwardlywhile permitting the I support to move downwardly independently of theplunger.

12. In a sirup dispenser for bottle filling machines, the combinationwith a reciprocating support, of a sirup receptacle, a connectionbetween said support and receptacle effecting lim-- ited downwardmovement of the receptacle with the support permitting a continueddownward movement of the support after the downward movement of thereceptacle has stopped, a plunger in said receptacle, and lost-motionmeans permitting said plunger and support to have an independentdownward movement with respect to said receptacle while causing thesupport to move the plunger upwardly with respect to said receptacle.

13. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a pump cylinder and a piston slidable therein, thecylinder and the piston being both axially movable, and means forbiasing the said cylinder and piston for movement in one direction, saidpiston having a pressure-operated valve therein for controlling theentrance of liquids into the pump cylinder.

14. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a pump cylinder and a piston slidable therein, thecylinder and the piston being both axially movable, means ior biasingthe said cylinder and piston for movement in one direction, said pistonhaving a valve therein for controlling the entrance of liquids into thepump cylinder, and stops for the piston and the cylinder, at least oneof the stops being adjustable.

15. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a pump cylinder and a piston slidable therein, thecylinder and the piston being both axially movable, means for biasingthe said cylinder and piston for movement in one direction, said pistonhaving a pressure-operated valve therein for controlling the entrance ofliquids into the pump cylinder, and means connected to said piston forlimiting the movement of the piston.

16. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body reciprocable in a vertically extendingdirection, a pump cylinder carried by the body, a pump piston movablerelative to the cylinder, pressure-operated inlet valve means carried bythe piston, and a source of liquid connected to said inlet valve.

17. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body reciprocable in a vertically extendingdirection, a pump cylinder carried by the body, a pump piston biased formovement relative to the body, means connected to the piston forlimiting the biased movement thereof, pressure-operatec inlet valvemeans carried by said piston, and a source of liquid connected to saidinlet valve.

18. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a body reciprocable in a vertically extendingdirection, a pump cylinder carried by the body, means for urging thepump cylinder downwardly, a stop for limiting the downward movement,means'on the lower end of the cylinder for engaging a container, saidmeans including a discharge valve for the pump cylinder, a pistoncarried by the body and extending into the pump cylinder, the pistonbeing slidable, yieldable means for urging the piston downwardly, meansconnected to the body for moving the piston upwardly, and meansconnected to the piston for limiting its downward movement relative tothe body.

19. In a, filling machine, a pump for discharging a measured quantity ofliquid comprising a body, a pump cylinder carried by the body andreciprocable relative thereto, means biasing said cylinder in onedirection, a piston movable in the cylinder in said direction fordisplacing liquid from the cylinder, said piston being also movablerelative to the body, and means connected to the piston for limitingmovement thereof upwardly and downwardly relative to the body.

'20. In a filling machine, a pump for discharging a measured quantity ofliquid comprising a pump cylinder, a piston slidable therein fordischarging liquid from the cylinder upon movement toward one endthereof, the cylinder and the piston being both axially movable, meansbiasing them for movementin the direction of discharging movement of thepiston, a stop for the cylinder and means connected with the piston formoving it upwardly and for limiting its movement caused by its biasingmeans.

21. In a filling machine, a pump having means for activating it on theexpulsion and intake strokes for discharging a measured quantity ofliquid comprising a body, a pump cylinder carried by the body, said pumpcylinder being reciprocable relative to the body and biased downwardly,means on the cylinder for engaging a container, a piston reciprocable inthe cylinder for pumping liquid, said piston being also movable relativeto the body, and means connected to the piston for limiting movement ofthe piston relative to the body.

LOUIS DE MARKUS.

